Name ______Date______Period: ______
Chapter 20 & 21 Electricity and Magnetism Review
Electricity?
- What particles do atoms contain?
- What does the law of conservation of charge state?
- What do opposite charges do?
- What do like charges do?
- Electrons move easily through…
- Electrons do not move easily through…
- What THREE ways can we transfer electric charge?
8. What is electric charge?
9. What is static electricity?
10. What is induction?
11. Like charges ______; opposite charges ______.
12. What is static discharge? Give an example.
13. What are the two types of current?
14. ______current- charges flow in only one direction.
15. ______current- is a flow of electric charge that regularly reverses its direction.
16. Define electrical conductor. Give at least 2 examples.
17. Most ______are good electrical conductors.
18. Define insulator. Give at least 3 examples.
19. What is resistance?
20. In order for charge to flow in a conducting wire, ______
21. Define potential difference.
22. Potential difference is also called ______.
23. Define battery.
24. What is Ohm’s Law:
- What is the flow of charges through a wire or conductor called?
- What is the unit used to measure electric current?
- What is Voltage difference? How is it measured?
- For charges to flow, the wire must always be connected in a what?
- What is the tendency for a material to oppose the flow of electrons, changing electrical energy into thermal energy and light? How is it measured?
- What are the two types of electric current?
- Which type of circuit has only one loop in which electrons flow? (Draw)
- Which type of circuit contains two or more branches for current to flow? (Draw)
- What are some devices that guard against the overheating of wires?
- Identify the electric charge and location of the following atomic particles:
Charge / Location
Proton
Neutron
Electron
- Describe the interaction between two like charges: ______
- Complete the table below:
Quantity / Symbol / Unit
Current
Voltage
Resistance
Power
- What will happen if a positively charged rod is brought near a metal washer? ______a plastic disk? ______
- Categorize the following as insulators (I)or conductors (C)?
a. Copper wire _____
b. Rubber tubing _____
c. A plastic comb
d. Wet skin ____
- Atoms become charged by gaining or losing ______.
- What is the resistance of a lamp when 25 amps uses 5 volts?
- Calculate the voltage supply needed to produce a current of 14 amp when used with a 38 ohm resistor.
- A 150 ohm resistor is connected to a 25 volt supply. What is the current?
Magnetism
43. What is magnetic force?
44. ______magnetic poles repel one another; ______magnetic poles attract one another.
45. Define solenoid.
46. What are two ways to increase the strength of an electromagnet?
47. The function of an electric motor is to change ______.
48. Define electromagnetic induction.
49. Where is the force of a magnet the strongest?
50. What is a generator?
51. What are some objects that are affected by the force of magnetism?
52. What is magnetism?
53. What is an electric motor?
54. Name the two poles of a magnet.
55. A ______is an example of a magnet that occurs naturally.
56. What happens if two north poles are brought together?
57. The area around a magnet where magnetic forces can act is called a(n) ______.
58. A turbine is a large wheel that is turned by ______.
59. Where is a magnet the strongest?
60. What happens if a north pole and a south pole are brought together?
61. What is magnetic induction?
62. Most of the energy we use every day comes from ______.
63. True of False: Some materials that are not natural magnets are easy to magnetize such as iron.
64. What is the center of an electromagnet called?
65. What happens if two south poles are brought together?
66. What is the difference between a temporary magnet and a permanent magnet?
67. The relationship between electricity and magnetism is called ______.
68. The process by which an electric current is produced by moving a wire in a magnetic field is ______.
69. What is an electromagnet?
70. What are some objects that are not affected by the force of magnetism?
71. What are two ways to make an electromagnet stronger?
72. An electric current passing through a wire causes a ______.
73. What is an electric motor made of?
74. ______– device that changes mechanical energy into electrical energy
75. Mechanical energy for many generators is supplied by ______.